/*
 * contrib/btree_gist/btree_inet.c
 */
#include "postgres.h"

#include "btree_gist.h"
#include "btree_utils_num.h"
#include "utils/builtins.h"
#include "utils/inet.h"
#include "catalog/pg_type.h"

typedef struct inetkey
{
    double        lower;
    double        upper;
} inetKEY;

/*
** inet ops
*/
PG_FUNCTION_INFO_V1(gbt_inet_compress);
PG_FUNCTION_INFO_V1(gbt_inet_union);
PG_FUNCTION_INFO_V1(gbt_inet_picksplit);
PG_FUNCTION_INFO_V1(gbt_inet_consistent);
PG_FUNCTION_INFO_V1(gbt_inet_penalty);
PG_FUNCTION_INFO_V1(gbt_inet_same);


static bool
gbt_inetgt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const double *) a) > *((const double *) b));
}
static bool
gbt_inetge(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const double *) a) >= *((const double *) b));
}
static bool
gbt_ineteq(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const double *) a) == *((const double *) b));
}
static bool
gbt_inetle(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const double *) a) <= *((const double *) b));
}
static bool
gbt_inetlt(const void *a, const void *b, FmgrInfo *flinfo)
{
    return (*((const double *) a) < *((const double *) b));
}

static int
gbt_inetkey_cmp(const void *a, const void *b, FmgrInfo *flinfo)
{
    inetKEY    *ia = (inetKEY *) (((const Nsrt *) a)->t);
    inetKEY    *ib = (inetKEY *) (((const Nsrt *) b)->t);

    if (ia->lower == ib->lower)
    {
        if (ia->upper == ib->upper)
            return 0;

        return (ia->upper > ib->upper) ? 1 : -1;
    }

    return (ia->lower > ib->lower) ? 1 : -1;
}


static const gbtree_ninfo tinfo =
{
    gbt_t_inet,
    sizeof(double),
    16,                            /* sizeof(gbtreekey16) */
    gbt_inetgt,
    gbt_inetge,
    gbt_ineteq,
    gbt_inetle,
    gbt_inetlt,
    gbt_inetkey_cmp,
    NULL
};


/**************************************************
 * inet ops
 **************************************************/


Datum
gbt_inet_compress(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    GISTENTRY  *retval;

    if (entry->leafkey)
    {
        inetKEY    *r = (inetKEY *) palloc(sizeof(inetKEY));

        retval = palloc(sizeof(GISTENTRY));
        r->lower = convert_network_to_scalar(entry->key, INETOID);
        r->upper = r->lower;
        gistentryinit(*retval, PointerGetDatum(r),
                      entry->rel, entry->page,
                      entry->offset, FALSE);
    }
    else
        retval = entry;

    PG_RETURN_POINTER(retval);
}


Datum
gbt_inet_consistent(PG_FUNCTION_ARGS)
{
    GISTENTRY  *entry = (GISTENTRY *) PG_GETARG_POINTER(0);
    double        query = convert_network_to_scalar(PG_GETARG_DATUM(1), INETOID);
    StrategyNumber strategy = (StrategyNumber) PG_GETARG_UINT16(2);

    /* Oid        subtype = PG_GETARG_OID(3); */
    bool       *recheck = (bool *) PG_GETARG_POINTER(4);
    inetKEY    *kkk = (inetKEY *) DatumGetPointer(entry->key);
    GBT_NUMKEY_R key;

    /* All cases served by this function are inexact */
    *recheck = true;

    key.lower = (GBT_NUMKEY *) &kkk->lower;
    key.upper = (GBT_NUMKEY *) &kkk->upper;

    PG_RETURN_BOOL(gbt_num_consistent(&key, (void *) &query,
                                      &strategy, GIST_LEAF(entry), &tinfo, fcinfo->flinfo));
}


Datum
gbt_inet_union(PG_FUNCTION_ARGS)
{
    GistEntryVector *entryvec = (GistEntryVector *) PG_GETARG_POINTER(0);
    void       *out = palloc(sizeof(inetKEY));

    *(int *) PG_GETARG_POINTER(1) = sizeof(inetKEY);
    PG_RETURN_POINTER(gbt_num_union((void *) out, entryvec, &tinfo, fcinfo->flinfo));
}


Datum
gbt_inet_penalty(PG_FUNCTION_ARGS)
{
    inetKEY    *origentry = (inetKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(0))->key);
    inetKEY    *newentry = (inetKEY *) DatumGetPointer(((GISTENTRY *) PG_GETARG_POINTER(1))->key);
    float       *result = (float *) PG_GETARG_POINTER(2);

    penalty_num(result, origentry->lower, origentry->upper, newentry->lower, newentry->upper);

    PG_RETURN_POINTER(result);

}

Datum
gbt_inet_picksplit(PG_FUNCTION_ARGS)
{
    PG_RETURN_POINTER(gbt_num_picksplit(
                                        (GistEntryVector *) PG_GETARG_POINTER(0),
                                        (GIST_SPLITVEC *) PG_GETARG_POINTER(1),
                                        &tinfo, fcinfo->flinfo
                                        ));
}

Datum
gbt_inet_same(PG_FUNCTION_ARGS)
{
    inetKEY    *b1 = (inetKEY *) PG_GETARG_POINTER(0);
    inetKEY    *b2 = (inetKEY *) PG_GETARG_POINTER(1);
    bool       *result = (bool *) PG_GETARG_POINTER(2);

    *result = gbt_num_same((void *) b1, (void *) b2, &tinfo, fcinfo->flinfo);
    PG_RETURN_POINTER(result);
}
